On Nov. 2, Todd Angilly was working as a bartender on level 5 at TD Garden when he heard a raucous noise.

He was interacting with fans and taking drink orders before the Bruins hosted the Vegas Golden Knights. There were only a few minutes before puck drop and the building was already loud, but he couldn’t figure out the cause of the commotion.

Suddenly, a Garden game-day employee grabbed Angilly and said his services were required at ice level.

He was needed to sing the national anthem.

So, two security guards escorted him to the Zamboni entrance in time to sing because the fill-in scheduled for that evening had not made it.

He was wearing his TD Garden uniform, so the event staff found a bull gang member’s black and yellow Bruins jacket for Angilly to wear.

“It smelled like gas and oil and they said, ‘Go,’” Angilly recalled. “I went on the ice and was like, ‘Let’s do it.’ I had a good time. Then went...